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Unmanned Spaceflight.com > Mars & Missions > Past and Future > MER > Opportunity
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elakdawalla
QUOTE (Matt Lenda @ Mar 31 2012, 06:19 PM) *
EDIT: Say, anybody got a blinking GIF of two hi-res front hazcams that show the apparent movement? I've got one from this side of the fence at JPL which I'm not allowed to use in my blog (have to pretend I'm a layman!)...

Happy to oblige. Here's two, one just a stupid animation of the two full frames, the other a detail in which I've aligned the rocks to remove that component of the apparent motion and adjusted levels to match.
Hungry4info
For what it's worth, an animation showing multiple wheel movements and some IDD inspection.


Matt Lenda
QUOTE (elakdawalla @ Apr 1 2012, 05:45 AM) *
Happy to oblige. Here's two, one just a stupid animation of the two full frames, the other a detail in which I've aligned the rocks to remove that component of the apparent motion and adjusted levels to match.

Bingo! Thanks, added to recent blog post... wink.gif

QUOTE (Hungry4info @ Apr 1 2012, 07:59 AM) *
For what it's worth, an animation showing multiple wheel movements and some IDD inspection.

Curious -- what sols are each frame? You seem to have spotted the second movement of the wheel the team is currently looking at...

-m
fredk
There was movement of the LF wheel between 2899 and 2901 - the frames are listed at this post.
ElkGroveDan
Dang. That one of Emily's really makes it look related to the arm movement. If this was an eight year old machine operating outdoors on Earth I'd be looking for crossover voltage from abrasion in the cable bundles, but surely that can't be the case in these environs. I would assume the team are looking at internal circuitry issues then?
fredk
If it's linked to the IDD movement, that doesn't mean it's an electrical problem. An IDD movement would shift the centre of mass of the whole rover (slightly), which may have been enough to precipitate the LF wheel "over the cliff", or to crumble a little piece of bedrock sticking up under the LF, or whatever. A sort-of "local marsquake", so to speak.
djellison
There's no reason to suggest any current went to the wheel motor - it didn't turn - and there are brakes on the wheel drive motors anyway that would have to be disengaged I believe.

Take the combo of moving the arm around (quite a lump on the end of a long stick), strong winds with large solar arrays, and on a rocky slope, it's easy to see how the rover could just nudge ever so slightly.

Indeed - up at the summit of Husband Hill, Craig Covault's article about 'Rocky Martian High' talks about concerns in moving the arm whilst on a slope that might cause the rover to move slightly.
centsworth_II
QUOTE (ElkGroveDan @ Apr 1 2012, 11:52 AM) *
Dang. That one of Emily's really makes it look related to the arm movement....
Looks can be deceiving. The second image shows the arm and wheel in new positions but that does not mean they moved to those positions at the same time..
ElkGroveDan
QUOTE (djellison @ Apr 1 2012, 09:04 AM) *
There's no reason to suggest any current went to the wheel motor - it didn't turn - and there are brakes on the wheel drive motors anyway that would have to be disengaged I believe.

I was envisioning a brief tug on the steering actuator rather than a wheel turn, but now that I think of it your suggestion sounds just as likely, perhaps more so.
eoincampbell
Is this serious enough for a testbed rover comparison ?
djellison
If current to an arm were to find its way to a steering actuator - that would be a symptom of something pretty catastrophic. I doubt it.

Seriously guys - that's not what's happened here.
DDAVIS
Here is my version of the SOL 2487 late afternoon view. I think the other view was more dramatic but this one has a wider view.

Low sun images provide dramatic shadows, and are too rare in this mission. I'm glad this was taken. A series of NAVCAM images in that direction could make an intriguing time lapse movie!

Click to view attachment
dilo
QUOTE (DDAVIS @ Apr 2 2012, 10:33 AM) *
Here is my version of the SOL 2487 late afternoon view.

Mamma mia!
fredk
An intriguing movie indeed. Some oldtimers might remember dreaming of a sequence like that at Victoria. We actually got lots of very cool rim-shadows-across-the-crater views there. Some can be combined into few-frame movies. Check out:
http://marsrovers.jpl.nasa.gov/gallery/all...DXP1314R0M1.JPG
http://marsrovers.jpl.nasa.gov/gallery/all...DXP1391R0M1.JPG
http://marsrovers.jpl.nasa.gov/gallery/all...DXP1391R0M1.JPG
Or these navcams:
http://marsrovers.jpl.nasa.gov/gallery/all...25P1816R0M1.JPG
http://marsrovers.jpl.nasa.gov/gallery/all...25P1816R0M1.JPG
http://marsrovers.jpl.nasa.gov/gallery/all...25P1816R0M2.JPG
ElkGroveDan
QUOTE (centsworth_II @ Apr 1 2012, 09:05 AM) *
Looks can be deceiving. The second image shows the arm and wheel in new positions but that does not mean they moved to those positions at the same time..

OBVIOUSLY. However neither does it rule out simultaneous movement. At this point we don't know. Which is why I chose the words "makes it look like" instead of "is proof positive," so that I could then speculate on the circumstances that might have occurred in the event of the latter. That's all I was doing, speculating. But the discussion has moved on now so let's drop it.
Bill
View of the left wheel in december before the move for the final position : We can see in front and on the right of the LF wheel the place where the wheel is now. There is a miniature "cliff".
http://qt.exploratorium.edu/mars/opportuni...00P1110R0M1.JPG

I don't see any crumbly rock under the wheel ; I agree with Fredk : "Maybe the LF wheel was perched on the edge of a miniature cliff, in an unstable position, and finally worked its way down".
My best guess on the position of the left wheel (in black) and the miniature "cliff" (in orange) /

Navcam
Click to view attachment

Pancam
Click to view attachment

Original pictures :
http://qt.exploratorium.edu/mars/opportuni...SMP1957L0M1.JPG
http://qt.exploratorium.edu/mars/opportuni...SMP2438L2M1.JPG
kungpostyle
Planetary Society report:

http://planetary.org/news/2012/0331_Mars_E...ver_Update.html
stevesliva
QUOTE (kungpostyle @ Apr 2 2012, 09:21 PM) *

Amazing amount of info in there on the wheel, radio science, and the Mossbauer.
fredk
Yeah. Bad news for the MB:
QUOTE
"The [MB] still works, but when we looked at the data... we concluded that the source strength is so low that we probably wouldn't have accumulated a useful spectrum by the time we were ready to move the rover," Steve Squyres... said

A plan for the LF wheel:
QUOTE
the engineers are planning on having the rover wiggle her left front wheel, which should relax any further stress on that wheel. "Separately, we are now imaging at least twice a day to detect further motion and to try to bound when it happens to it can be correlated to other activities (if such a correlation exists)," said Nelson
.
And some ideas for when driving resumes:
QUOTE
Arvidson: "We need to go back to the Bench, where we saw the gypsum vein Homestake and find a bigger one that we can grind into, remove any coating, and redo the measurements." "Once we start moving, we'll pop out to the Bench either on the east side or the west side"

QUOTE
There is also talk of Opportunity roving up to Morris Hill... "It's pretty steep, so we still have to evaluate whether we can actually drive onto it, or just look at it from a safe distance," [Squyres] said.

QUOTE
"We'll move when we're ready to move," said Squyres. "June is a reasonable guess, but that could change depending on tau, dust factor, etc. General plan is to head south, performing more investigations on Cape York and then heading toward Cape Tribulation."
fredk
Looks like the LF tests are happening soon - from Maxwell's blog:
QUOTE
Today, we help recover from Opportunity's LF wheel anomaly: spin and wiggle wheel, twice, plus lotsa pictures. Should be a fun one.
fredk
Oppy doing the LF "spin and wiggle dance":
Click to view attachment
jamescanvin
A week or so ago Stu asked me for some advice on matching features of Cape Tribulation from HiRISE and Pancam. It has taken me a while to find the time, and I'm not totally sure on some of this, but here is an 'inverse polar' HiRISE image from Greeley Haven along with a pancam image with a few lines to show what I think are matching features.

Click to view attachment

James
fredk
I agree with those identifications, except that I think the dark feature marked in cyan is pretty heavily foreshortened, and actually extends much closer to the light features marked in green. So I think it also includes the dark stuff I've circled in cyan in this pic:
Click to view attachment
jamescanvin
Yeah I was thinking the same after I posted it last night. Glad you agree wih the rest of the ID's

J
Stu
Thanks VERY much James for working on that - and you, too, Fred, for your input. I'm really wanting to get a handle on that part of the rim befpre Oppy strikes out for it.
brellis
On April 1st a 'small dust cleaning event' improved the dust factor a tiny bit. Hope that wasn't an April Fool's Joke smile.gif
Stu
Hmmmm. Oppy taking lots of super resolution images of a feature on the NE edge of Cape York called "Whim Creek"...

Click to view attachment

Wondering... Is that our beloved "Notch"/"Wedge"/"Wound"..? And does this mean Oppy will be heading down to take a look at while she hunts for a larger version of Homestake when she finally rolls down from Greeley Haven..?

fredk
Good catch, Stu! I've marked the "inland" part of the dagger with a black line, and the "outflow" part in white:
Click to view attachment
I hope this means a visit. Remember a recent update where they said they may go either to the east or west side of CY to look for more veins...
PDP8E
I agree with you Stu and Fred...

... searches for "Whim Creek" all seem to point to a copper mine and basaltic flow region in Western Australia

http://en.wikipedia.org/wiki/Whim_Creek,_Western_Australia
Stu
Been doing a bit of virtual hill wandering thanks to James' and Fred's cartography, and it turns out that that ridge... thing... way up on the hillside there is actually a fascinating place...

Click to view attachment

Looks like a real geological playground... but 4km away from where we are now... and uphill...

More pics n stuff here: http://roadtoendeavour.wordpress.com/2012/...ng-ahead-and-up
fredk
Yep, my eye's been drawn to that ridge for quite a while, too. Our best view of it so far was the superres from 2720 - here's the full-res tiff: http://pancam.astro.cornell.edu/pancam_ins...superres_4x.tif

BTW, that ridge is on the way to Cape Tribulation proper, which appears to have the largest exposures of clays, so depending on our precise route we may pass close to that ridge...
vikingmars
QUOTE (Stu @ Apr 9 2012, 09:13 PM) *
Hmmmm. Oppy taking lots of super resolution images of a feature on the NE edge of Cape York called "Whim Creek"...
Wondering... Is that our beloved "Notch"/"Wedge"/"Wound"..? And does this mean Oppy will be heading down to take a look at while she hunts for a larger version of Homestake when she finally rolls down from Greeley Haven..?

In France, it is dubbed "the Dagger"...
PDP8E
On Sol 2901, Oppy took some images of tread marks, one set was an L456... Its a high sun angle (1:15pm)
Click to view attachment

Stu
"Fast and Furious XXV: Martian Mayhem"...

Click to view attachment

laugh.gif
James Sorenson
And the pancam all-filter foreground mosaic sofar. I'm using the L456 filter combination. pancam.gif
Click to view attachment
Stu
Beautiful colours, James, really nice.
James Sorenson
Thank you Stu.

Here is also a Vertical projection.

Click to view attachment
walfy
A nice micro from Sol 2924:

Click to view attachment
walfy
Usually these don't render well, but this one did. Here's a small version (original was too large to upload to UMSF, but can be viewed here).

Click to view attachment
CosmicRocker
That's quite nice. Thanks for posting a link to that site.

I see what you mean about some image pairs not rendering well. I wonder what causes some to work nicely and other not.
Stu
Cleaned-up etc MI image... interesting wee rocks down there, Oppy...

Click to view attachment
walfy
Another new micro. One of the two images was in shadow, hence no 3D on the right.

Click to view attachment
Phil Stooke
We can recover that stereo by brightening the shadow in the red channel.

Phil

Click to view attachment
walfy
QUOTE (Phil Stooke @ Apr 23 2012, 10:53 AM) *
We can recover that stereo by brightening the shadow in the red channel.


Oh my, very nice!
Oersted
Umsf image wiz strikes again smile.gif
Matt Lenda
This is me poking my head in...

Hi!

I feel like we need some more far-seeing SuperRes images in here, spice things up...

-m
gregson
I don't know why, but I have feeling thereis nothing heappening now on mars. The rover is staying in one place and...few pictures.
Phil Stooke
There are quite a lot of new pictures, but if you are doing change detection and nothing changes...

To some extent we are drive junkies, looking for a new view every day. But there are non-image instruments and experiments working hard as well. So lots going on, not much posting. And I'm tied up with Spirit right now... but look out Opportunity, I'll be on your tail soon.

Phil
mhoward
I don't have super-res capability at the moment, but I do have a lot of stereo pairs. By an amazing coincidence, these work well on a screen that's about 3.5" diagonal, held in landscape orientation at a comfortable distance. Stereo freeviewing is my new favorite thing.

Whim Creek (sol 2917) and "Mt. Goldsworthy" (sol 2935).
Stu
Verrrry nice smile.gif

I love how you can almost feel the ground up ahead dropping away when you look at this 3D view...

Click to view attachment

(from "Road to Endeavour" blog update: http://roadtoendeavour.wordpress.com/2012/...thy-destination )
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